See, that one works a lot better for me. Scarecrow was portrayed from the beginning as someone who only manages to appear intimidating through theatricality and deception, so him being defeated in such an easy way was fitting of the character. Even aside from that, Scarecrow never feels like the movie's chief bad guy (certainly not in the way Bane does) and by the time he gets taken out of the picture, Ra's Al Ghul has been established as the main villain for a good amount of screentime already.

Compare that to Bane, who gets demoted from lead villain and blown off screen in the span of about 2 minutes. And while Scarecrow was a weakling who appears strong through smoke and mirrors, Bane was anything but.